For some time now I have had small back spots on one of my clown loaches. This has now, over a period of weeks, started to affect the other clown loaches in the tank. The sports are quite small ( 1/2 mm ) and are all over the fish. The fish do not seem adversly affected by it, but I wouls like. This is not ick ( being black) but I wodered if anybody had seen this before ?